What do you hope will happen differently here, this time, now, after “dealing with for nearly two years” of working with others including with Apple Support to resolve whatever you believe is happening here?
After resetting and reloading, after password changes to new and unique and robust passwords, after wholesale new passwords, after enabling and using two-factor authentication, and after all the other steps which have undoubtedly already been suggested, and have already been implemented?
All of which and more have undoubtedly been previously suggested, and have been performed.
Having an Apple ID enabled for developer access is free or is a yearly USD$99 subscription (optionally auto-renewed), and is immaterial to what you are reporting. All Apple IDs can run beta software, whether free-tier or paid-tier developer or non-developer Apple ID. And as you’ve previously reloaded your devices, you don’t have any beta software installed.
If you want your Apple ID removed from the developer program, or removed from Apple Business Manager, or both, you will need to discuss that directly with Apple. Nobody here can help with that, as we cannot access your Apple ID and settings and entitlements as established.
Again, I don’t see a path out of this that won’t have already been suggested.